The Church of Jesus Christ of Latter-day Saints

Three missionaries of The Church of Jesus Christ of Latter-day Saints started proselyting to white English-speaking people in Cape Town in 1853. Most converts from this time emigrated to the United States. The mission was closed in 1865, but reopened in 1903.The South African government limited the amount of missionaries allowed to enter the country in 1921 and in 1955. Starting around 1930, a man had to trace his genealogy out of Africa to be eligible for the priesthood, since black people were not permitted to be ordained. In 1954 when church president David O. McKay visited South Africa, he removed the requirement for genealogical research for a man to be ordained, stipulating only that "there is no evidence of his having Negro blood in his veins".

After the church's 1978 Revelation on Priesthood removed the official prohibition against black priests, local opposition continued. The South African government lifted the restrictions on visiting missionaries.

Source: Wikipedia